That is what I used to assume.
Was this not recently identified as an insufficiently shielded power cable inducing thrust via the earth magnet field?
He is a true believer. The very worst and most dangerous class of fundamentalist fanatic.
Sounds like high-intelligence, high-arrogance and no wisdom at all. That is not smart, that is exceptionally dumb.
You expect a fundamentalist and bureaucrat to learn from history? How is that supposed to work? These people do not even learn if what they do fails catastrophically.
Your number sucks badly. I have had flash media fail in as little as 6 months form discharge and that was after 2-3 overwrites.
Incidentally, your claim reminds me a lot of what many people defending DVDs as backup claim. It is straight in the region of wishful thinking. Sure, it may work, but it also may leave you without that critically needed backup without warning and it may do so with pretty high probability.
"mdadm" is very well behaved for this scenario and in general. For mdadm this is indeed relatively easy to do.
I had the misfortune to work with some commercial hardware-RAID cards where I am not even sure it can be done without major effort. Personally, I have stopped using any kind of hardware-RAID, because monitoring, management, reliability and performance typically all suck badly.
Well, there are those that get this and those that will suffer a catastrophic data loss sooner or later. Enough of the second group around. Usually they are much less proud of their flawed little ideas after it has happened to them.
And if it is the trash you can buy, you may have a problem from the disk being marked as "dirty". I take it you have never actually done this?
And where did you miss that a backup needs to be followed by a compare? After that works, it really does not matter what your obviously "trash" quality SATA-to-USB converter messes up. I never had this problem despite using a _lot_ of USB disks. Maybe you should not buy the very cheapest ones?
Your rally have no clue what checksumming goes into USB and modern HDDs. The most likely candidate for corruption on external disks (and I never said it was impossible) affects internal disks as well.
You seem to have no clue what a snapshot is. Maybe read a definition sometime before shooting off your mouth?
We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise. -- Larry Wall